O-Ring No Metal Detectable No X-Ray Detectable System of Measurement Inch Cross Section Shape Round O-Ring Material Silicone Durometer (Hardness) Rating Medium Hard Nominal Inside Dia 3 1/2 in Nominal Width 1/4 in Actual Inside Dia 3.4 in Actual Width 0.275 in Dash Number 417 Color Red Durometer 70 Shore A Meets/Exceeds FDA Nominal Outside Dia 4 in Actual Outside Dia 4.025 in Temp Range -80 Degrees to 450 Degrees F FDA Approved Yes